@article{10_4064_aa149_3_4,
     author = {Nour Ghazi},
     title = {On the {Beckmann{\textendash}Black} problem},
     journal = {Acta Arithmetica},
     pages = {265--274},
     publisher = {mathdoc},
     volume = {149},
     number = {3},
     year = {2011},
     doi = {10.4064/aa149-3-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa149-3-4/}
}